Ridge and furrow on Clack Hill, to the east of Little Bowden, Leicestershire, England.
The ridged pattern of the field was created during the Medieval period when the land was farmed in strips. From Wikipedia (http://en.wikipedia.org/wiki/Ridge_and_furrow):
The earliest examples date to the immediate post-Roman period and the system was used until the 17th century in some areas. Ridge and furrow topography is found in Great Britain, Ireland and elsewhere in Europe. The surviving ridges are parallel, ranging from 3 to 22 yards (3 to 20 m) apart and up to 24 inches (61 cm) tall – they were much taller when in use. Older examples are often curved.
Ridge and furrow topography was a result of ploughing with non-reversible ploughs on the same strip of land each year. It is visible on land that was ploughed in the Middle Ages, but which has not been ploughed since then. No actively ploughed ridge and furrow survives.
Cyan cast removed in CornerFix
12 recovery in ACR
Adjustment brush used in ACR to darken houses
Cropped & straightened in ACR
White balance adjusted in ACR